Quarterly demand for smartphones at a retailer is as shown.

Year	Quarter	Demand
1	I	513
	II	932
	III	1,509
	IV	1,902
2	I	693
	II	1,163
	III	1,857
	IV	2,469
3	I	846
	II	1,439
	III	2,271
	IV	3,079
4	I	1,070
	II	1,751
	III	2,785
	IV	3,613

Forecast quarterly demand for year 5 using the following models:

1. 4-week simple moving average
2. Simple exponential smoothing with=0.1
3. Trend adjusted exponential smoothing (Holt's model) with=0.1and=0.1
4. Linear regression with seasonality